Starting switch



April 13 191ml l.. M. PERSONS STARTING swITcg l Filed Oct. 20, 1920 2Sheets-5h86?. 2

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` To all 'whom t may concern.'

'Patented Apr. 13, 1926.

UNITED STATES' len'rislsi'r oFFIclI-z.l

LAWRENCE M. PERSONS, OF QUINCY, ILLINOIS, ASSIGNOR TO COOK ELECTRICCOM-4 1 PANY, or CHICAGO, ILLINOIS,

A CORPORATION OF ILLINOIS.

STARTING SWITCH.

Application led October 20, 1920.l Serial No. 418,305.

Be it known that I, LAWRENCE soNs, a citizen of the United States,resid# ing at Quincy, in the county of Adams and State of Illinois, haveinvented certain new and useful Improvements in Starting Switches, ofvwhich the following is a specification.

My invention relates/ to starting switches particularly adaptable foruse in'alternating currentV motors, and has for one of its objects theprovision of a simple and efficient switch for cutting in and out anauxiliary winding used in. connection with starting an alternatingcurrent motor.

Another object is the provision of a simple and eliicient startingswitch of the character mentioned which can be easily, put together andtaken apart. f

A furtherl object is the provision of a starting switch of' thecharacter mentioned having therein.

l A still further lobject is the provision of a switch of Ithe charactermentioned of simple construction 'as hereinafter described and morefully set forth in the appended claims. I

An embodiment of my invention is shown in the vaccompanying drawings,forming a part of this specification, and in which- Y Fig. 1'is afragmental section showing a portion of an electric motorfeqnipped witha switch embodying my invention;

Figs. 2 and 3 are similar views taken as from line 2-2 in Fig. 1 withthe switch no screws, bolts, or the like, used mechanism in Fig. 2 idierent positions than in Fig. 3;

Fig. 4 is a fragmental transverse sectlon showlngmy switch devicepartially as-v sembled; and

iso

Fig. 5 is a longitudinal section showing lparts ofmy switch andfragments of an electric motor disassembled.

Referring more particularly to the drawings, I have indicated a fragmentof an electric motor having afield core 6 having two sets of windingsthereon, the yterminals 7 and 8 of one of the windings being brought outandv secured to an insulating -block 9 on the motor cap 10. One terminal11 of the other Winding onV the field` core 6' is con- "nected with theterminal 7 under a screw 12 in block 9 where it is adapted to beconnected with the feed circuit, not shown.

M. PER# sulated' from the latter by insulation 16.y

Also, on the cap 10 is a contact 17 secured thereto and insulatedtherefrom by an 1n-l sulation 16. From the Contact 17 a wire 18 connectswith the terminal 8 of the firstmentioned winding on core 6 and isconnected to the insulating block 9 by ascrew 19. The screw 19 isadapted to be connected with the other wire of the supply circuit, notshown.

A bearing 20 is provided in the cap 10 and in said .bearing is journaleda motor shaft 21 which carries` an armature 22. The field core and itswindings and the armature maybe of, any conventional or preferredvconstruction used in alternating current motors.

vMy improved switch and its operating mechanism comprises two weights23, which in the present instance are indicated as semicylindricalmembers of sheet material each pivoted on an axis 'at one side of theaxis of the shaft 21. The .weights 23 ymay be pivoted in any desirablemanner, but Ito make them easily assembled and disasp openings 24. Whenthe weights 23 are in ltheir positions .shown in Figs. 2 and. 3, theears 25 will'be securely locked in the openings 24, but when some of theparts are removed from the switch and the Weights are in their positionsshown irl/Fig. 5, they may be-slid longitudinally of the shaft to removethe ears 25 out of openings 24.

'Around' the shaft I provide .a ring 26 which has two arms.27 thereon.The arms 27 have their outer ends disposed in openings 28 in the weights23.v The arms are preferably of such lengths that when the ring 26 issubstantially concentric with shaft 21 the arms will be 1n openings 28even when the weights 23 are in their outmostv swinging positions,'suchas indicated in Fig. 3. By moving the ring 26 first toward one side ofthe shaft and then the other the arms 27 may be removed from theopenings 28. In

use I provide a tube 29 between shaft 21 e and ring 26 to hold thelatter concentric with spacing means between the cap 10 and armature 22.I have indicated a liber or other friction-alleviating washer 30 betweenthe end of sleeve 29 and cap 10 which is usually provided in motors ofthis kind.

f The weights 23 are provided with a spring 31 or other resilientmeanswhich tends to swing them toward shaft 21. The ring 26 is provided witha restricted portion 32 on which is rotatably mounted a liber or otherinsulating washer 33. The washer may be held from moving 0H the end ofring 26 in any desirable manner, such as by a sprmg wire 34 disposed ina groove around the end of said ring 26, as clearly indicated in Fig..3.On the outer edge of the washer 33 is an electrical conductor ring 35adapted toy engage contacts 14 and 17 to complete the circuit throughterminals 13 and 11 of one of the coils on core 6. I preferably mountthe washer 33 and its ring 35 in such a manner that it is free to rotateon ring 26 and also provide it with limited longitudinal movement withrelation to said ring.

It will be noted that with thiseonstruction by removing screws 36 whichhold the cap 10 in place, this cap being a part of the motor casing, myimproved switch can be taken apart and put together without removing anyother screws or bolts. In assemblin the device in the first place, theears 25 are looked into the openings 24 when the weights 23 are in theirpositions indicated in Fig. 5, then the ring 26 with its arms 27 areplaced between the weights and the arms inserted in openings 28, asindicated in Fig. 4. The tube 29 is then placed between ring 26 andshaft 21. ``VVl1en the washer l33 has been taken off the ring 26, wire34 can be sprung into its groove after said washer is placed on itsrestricted portion of ring 26. When theI cap 10 is placed in positionthe switch is ready for use. To disassemble, the reverse order ofprocedure is had.

In use the winding of the field 6 are such that the winding having theterminals 7 and 8 are the one which operate the motor after it hasattained its designated speed. In order to bring the motor up to itsdesignated speed the coil having terminals 11 and 13 are wound on thefield in a manner to cause the motor to come up to its designatedspeed'upon` current being admitted to screws 12 and 19. When the motoris at rest spring 31 pullin on the weights 23 holds the contact mem er34 in engagement with. contacts 14 and 17 thereby com leting thestarting circuit of the field 6. introduced at points 12 and 19 thearmature starts to revolve and the centrifugal force iu weights 23 movesthe ring 26 longitudinally of tube 29 and' draws the contact 35 awayfrom the contacts 14 and 17. The spring 31 has suiicient tension so thatthe contact 35 will not be disconnected from pon current being contacts14 andy 17 until thecmotor reaches its designated speed. As soon as thecontact 35 is disconnected from contacts 14 and 17 on the field circuithaving terminals 7 and 8.k

I preferably form the ring 26 and tube 29 so that there is slight playbetween them. Also, the opening in washer 33 is slightly larger than therestricted portion 32 so that the contact member 35 can alwaysengagebotlrof the contacts 14 and 17 egsily. By making these parts fitloosely it will be seen that they will shift sufficiently to accommodatealways getting good contacts between the member 35 and members 14 and17.

An important feature of the particular arrangement of the contact-makingpartsl is having the member 33-35 loosely lmounted so that when it ismoved away or comes into engagement with the contacts 14 and 17 it tendsto brighten up the engaging surfaces as it leaves or engages saidcontacts 14 and 17. When leaving the contacts 14 and 17 as it begins torevolve it rubs onthe surface of contacts 14 and 17 When it comes intoengagement with said contacts 14 and 17 its inertia causes it to rotatea very short time upon engaging said contacts, thereby keeping thecontacting surfaces in good conducting condition.

1,-A motor starting switch comprising a motor shaft; a weight pivotallymounted to swing relative to said shaft; a ring around said shaft andslidable longitudinally thereof; an 'arm on the ring engaging saidweight; a spacing tube spacing said ring from said shaft; a fixedcontact; and a con' tact on said ring having limited longitudinalmovement with respect to the latter and adapted to be moved by said ringin`to enh 3. A motor starting switch comprising a I motor shaft; twoweights pivoted on spaced axes at the sides of the axis of said shaft;resilient means tending to swing said weights toward said shafts; a ringaround said shaft and slidable longitudinally thereof; arms on the ringengaging said weights; a tube between said ring and shaft; a fixedcontact; and a contact rotatably mounted with respect to the shaftadapted to engage said fixed` contact.

4. A motor starting switch comprising a motor shaft; pivotally mountedweights each having an opening therein; a ring around said shaft andslidable longitudinally thereof; arms on the ring engaging saidopenings; a tube spacing the ring substantially concentrically aroundthe shaft and holding said armsv in said openings; a iiXed contact; anda contactcarried by said ring adapted to engage the fixed contact.

5. A motor starting switch comprising a motor shaft; pivotally mountedweights on opposite Vsides of said shaft with each weight having anopening therein; a ring around said shaft; arms on said ring engagingsaid opening; a tube spacing the ring substantially concentricallyaround the shaft; .-1. fixed contact; a contact rotatably mounted onsaid ring and having limited longitudinal movements with respect to thering; and a spring tending to pull said weights toward each other,

6. A motor starting switch comprising a shaft; an armature on the shafta motor cap having a bearing therein in which an end of the ring fromthe shaft and the cap from the armature.

shaft; an armature on the shaft; two weights pivoted to the armature atopposite'sides of the shaft and having openings therein; a springbetween the weights tending to swing the lutter toward said shaft; aring around the shaft; arms on the ring extending in said openings; anda tube between the ring and shaft holding the spring in said openings,the ring, arms and tube being arranged to permit removal of the armsfrom said openings when the tube is removed from between said shaft andring.

In testimony whereof I have signed my name to this specification on this28th day of September, A. D. 1920.

' LAWRENCE M. PERSONS.

l A 7. A lnotor starting switch comprising avv

